im stuck on this maths thing
so, basically how on earth does
cos(x+20) turn into sin(90-20-x)
if u want the full question,
given that 4sin(x+70) = cos(x+20) show that tanx = -3/5tan(70)
cos(x+20) turn into sin(90-20-x)
if u want the full question,
given that 4sin(x+70) = cos(x+20) show that tanx = -3/5tan(70)
Generally for any angle in degrees, ; and equivalently .
When , we can see this using a right-angled triangle—but it infact holds more generally for any value of in degrees.
(When is in radians, we put instead of .)
When , we can see this using a right-angled triangle—but it infact holds more generally for any value of in degrees.
(When is in radians, we put instead of .)
(edited 3 years ago)
Original post by Integer123
Generally for any angle in degrees, ; and equivalently .
When , we can see this using a right-angled triangle—but it infact holds more generally for any value of in degrees.
(When is in radians, we put instead of .)
When , we can see this using a right-angled triangle—but it infact holds more generally for any value of in degrees.
(When is in radians, we put instead of .)
okat thank you.
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